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On R, binary operation ** is defined by ...

On R, binary operation `**` is defined by `a ** b = a + b + ab` then identity and inverse of `**` are _______ respectively.

A

`0 , (a)/( 1 -a )`

B

`1, (a)/(1 + a )`

C

`0, - (a)/(1 +a )`

D

`1, (a)/(1-a )`

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